JP3021014B2 - Metal surface hardening method - Google Patents
Metal surface hardening methodInfo
- Publication number
- JP3021014B2 JP3021014B2 JP2257123A JP25712390A JP3021014B2 JP 3021014 B2 JP3021014 B2 JP 3021014B2 JP 2257123 A JP2257123 A JP 2257123A JP 25712390 A JP25712390 A JP 25712390A JP 3021014 B2 JP3021014 B2 JP 3021014B2
- Authority
- JP
- Japan
- Prior art keywords
- treated
- metal
- carburizing
- gas
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は金属の表面硬化方法に関し、特に耐摩耗性を
必要とする摺動部部品機械工具の機械構造物製造に有利
に適用される金属表面の硬化方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for hardening a metal surface, and more particularly to a metal which is advantageously applied to the manufacture of a mechanical structure of a sliding part machine tool requiring wear resistance. It relates to a method of hardening a surface.
従来、耐摩耗性を向上させるために、ガス浸炭処理を
行ったり、Cr拡散処理を行った後、ガス浸炭処理を行な
い表面硬度を約800〜1200Hvに高めて、摺動部材料や石
炭灰等による摩耗を受けるボイラチューブ等に適用され
てきた。Conventionally, in order to improve wear resistance, after performing gas carburizing treatment or performing Cr diffusion treatment, gas carburizing treatment is performed to increase the surface hardness to about 800 to 1200 Hv, and sliding parts materials and coal ash etc. It has been applied to boiler tubes and the like that are subject to wear due to erosion.
浸炭及びCr拡散処理後のガス浸炭処理によって約800
〜1200Hvの表面硬度を有する耐摩耗材が提供されている
が、通常のガス浸炭の場合、雰囲気中の酸素等により浸
炭時又は浸炭前の段階でCr拡散処理材表面にCrの酸化物
層が形成され以後の浸炭を阻害し、同一被処理物表面で
も、浸炭部非浸炭部が発生し、均一な浸炭層が得られず
十分な硬度が確保できない欠点があった。Approx. 800 by gas carburizing after carburizing and Cr diffusion
Abrasion resistant material with surface hardness of ~ 1200Hv is provided, but in the case of normal gas carburization, a Cr oxide layer is formed on the surface of the Cr diffusion treated material at the stage of carburizing or before carburizing due to oxygen etc. in the atmosphere Carburization is hindered thereafter, and a carburized portion is not carburized even on the same surface of the object to be treated, so that a uniform carburized layer cannot be obtained and a sufficient hardness cannot be secured.
本発明は上記技術水準に鑑み、従来技術のような不具
合がない高硬度の表面硬化層を有する耐摩耗材を得るこ
とができる方法を提供しようとするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned state of the art, and aims to provide a method capable of obtaining a wear-resistant material having a hardened surface hardened layer having no problem as in the related art.
〔課題を解決するための手段〕 本発明は被処理物である金属をCr拡散浸透処理して表
面のCr濃度を高めた後、該Cr濃度を高めた金属の表面に
水素ガス又はアルゴンガスの共存下でプラズマ浸炭処理
を行い、金属表面に高硬度のFe,Cr及びＣからなる複合
炭化物層を形成させることを特徴とする金属の表面硬化
方法である。[Means for Solving the Problems] The present invention increases the Cr concentration on the surface by performing Cr diffusion and infiltration treatment on the metal to be treated, and then applies hydrogen gas or argon gas to the surface of the metal with the increased Cr concentration. This is a metal surface hardening method characterized by performing a plasma carburizing process in the coexistence to form a complex carbide layer made of Fe, Cr and C with high hardness on the metal surface.
すなわち、本発明は被処理物である金属の表面にCrを
拡散浸透させた後プラズマ浸炭処理を行うものであり、
これによりCr拡散層全域にFe,Cr及びＣからなる複合炭
化物層を均一に形成させることができる。本発明におけ
るCr拡散浸透処理は、通常クロマイジング処理と呼ばれ
ているもので、一般的には鋼板製半密閉容器を用い金属
Cr粉65〜80wt％、Al2O3粉19〜34wt％、NH4Cl粉0.5〜1.0
wt％からなる混合粉末に被処理物を埋め込みH2ガスを流
しながら950〜1150℃で５〜15時間加熱する方法であ
る。That is, the present invention is to perform plasma carburizing treatment after diffusing and infiltrating Cr on the surface of the metal to be treated,
Thereby, a composite carbide layer composed of Fe, Cr and C can be formed uniformly over the entire Cr diffusion layer. The Cr diffusion infiltration treatment in the present invention is generally called a chromizing treatment, and is generally performed using a steel plate semi-closed container and
Cr powder 65~80wt%, Al 2 O 3 powder 19~34wt%, NH 4 Cl powder 0.5-1.0
This is a method in which an object to be treated is embedded in a mixed powder of wt% and heated at 950 to 1150 ° C. for 5 to 15 hours while flowing H 2 gas.
このクロマイジング処理により被処理物の表面には層
厚15〜250μｍ、表面Cr濃度20〜80wt％のCr拡散浸透層
が得られるが、被処理物材の材質、用途、摩耗の程度に
応じ、又、処理条件を組み合わせることにより任意に層
厚、表面Cr濃度を変化させることができる。By this chromizing treatment, a Cr diffusion infiltration layer with a layer thickness of 15 to 250 μm and a surface Cr concentration of 20 to 80 wt% can be obtained on the surface of the object to be treated, depending on the material, application, and the degree of wear of the material to be treated. The layer thickness and the surface Cr concentration can be arbitrarily changed by combining the processing conditions.
本発明の特徴は上記でも述べたように、Cr拡散浸透処
理後、プラズマ浸炭処理を行って緻密な複合炭化物を均
一に形成させることであって、そのプラズマ浸炭処理は
水素ガス又はアルゴンガス中にプロセスガスとしてCO,N
2,CH4,C3H8の複合種の混合ガスを用い、数Torrの低圧雰
囲気下でグロー放電を発生させ900〜1100℃の高温下で
0.5〜３時間行なわれるものである。浸炭の機構は被処
理物表面のクリーニング、Ｃイオンの捕獲、付着、打込
み及び拡散の連続した浸炭機構によって行なわれる。As described above, the feature of the present invention is that, after the Cr diffusion and infiltration treatment, plasma carburizing treatment is performed to form a dense composite carbide uniformly, and the plasma carburizing treatment is performed in hydrogen gas or argon gas. CO, N as process gas
Glow discharge is generated in a low pressure atmosphere of several Torr using a mixed gas of 2 , CH 4 and C 3 H 8 and a high temperature of 900 to 1100 ° C.
This is performed for 0.5 to 3 hours. The carburizing mechanism is performed by a continuous carburizing mechanism of cleaning the surface of the workpiece, capturing, adhering, implanting and diffusing C ions.
なお、ここで、Cr拡散浸透処理材において、ガス浸炭
方法では著しく浸炭効率が低下する理由としては浸炭前
の処理面の汚染あるいは酸化が原因と考えられる。Here, in the case of the Cr diffusion infiltration treatment material, the reason why the carburization efficiency is remarkably reduced by the gas carburization method is considered to be the contamination or oxidation of the treated surface before carburization.
これに対して、プラズマ浸炭では上記にも述べたよう
に被処理面の浸炭前のクリーニング及び真空中での処理
のため、酸化が防止でき、これにより浸炭効率が上昇す
るものと考えられる。On the other hand, in the case of plasma carburization, as described above, since the surface to be treated is cleaned before carburizing and treated in a vacuum, it is considered that oxidation can be prevented, thereby increasing the carburizing efficiency.
50×80×3tのSUS 420J2製テストピース５枚を用いCr
拡散浸透処理を行うため、金属Cr粉75wt％、Al2O3粉24.
5wt％、NH4Cl粉0.5wt％からなる混合粉末を鋼板製半密
閉容器を用い、上記テストピースと共に埋設、充填し、
水素ガスを流しながら1050℃で10時間のクロマイズ処理
を行い、層厚140μｍ、表面Cr濃度55.5wt％、硬度200〜
250Hvの被処理材を得た。50 × 80 × 3t of SUS 420J 2 Test pieces made five to using Cr
75% by weight of metal Cr powder, Al 2 O 3 powder 24.
A mixed powder consisting of 5 wt% and 0.5 wt% of NH 4 Cl powder is buried and filled together with the test piece using a steel plate semi-closed container,
Perform chromizing treatment at 1050 ° C for 10 hours while flowing hydrogen gas, layer thickness 140μm, surface Cr concentration 55.5wt%, hardness 200 ~
A material to be treated of 250 Hv was obtained.
その後、同時に処理したテストピースを1050℃で２時
間のプラズマ浸炭処理を施し硬さ800〜1500Hvで均一に
浸炭された処理材を得た。Thereafter, the test pieces that were simultaneously processed were subjected to plasma carburizing treatment at 1050 ° C. for 2 hours to obtain a uniformly carburized material having a hardness of 800 to 1500 Hv.
その断面金属組織の光学顕微鏡写真を第１図に、断面
の硬度分布を第２図に示す。FIG. 1 shows an optical microscope photograph of the cross-sectional metal structure, and FIG. 2 shows a hardness distribution of the cross-section.
また、同時に処理した同材質のCr拡散処理材にCO30
％、CH425％、H240％、CO20.1％、残部N2からなる変成
ガスを用い、1000℃で1.5時間のガス浸炭処理を施し従
来の硬化方法による被処理材を得たが一部で浸炭されて
いない部分が認められた。In addition, CO30
%, CH 4 25%, H 2 40%, CO 2 0.1%, and the rest of N 2 were subjected to gas carburizing at 1000 ° C for 1.5 hours to obtain a material to be treated by the conventional curing method. Some parts were not carburized.
その断面の金属組織の光学顕微鏡写真を第３図に、ま
た、断面の硬度分布図を第４図に示し、さらに、浸炭さ
れている部分の断面の金属組織の光学顕微鏡写真を第５
図に、断面の硬度分布図を第６図にそれぞれ示した。FIG. 3 shows an optical micrograph of the metal structure of the cross section, FIG. 4 shows a hardness distribution diagram of the cross section, and FIG. 5 shows an optical micrograph of the metal structure of the cross section of the carburized portion.
FIG. 6 shows a hardness distribution diagram of the cross section in FIG.
更に、耐摩耗性比較のため、本発明硬化方法による前
述のテストピースと、従来硬化方法によるテストピース
を粒径100μｍ以下、固形物濃度30％となるように、水
を添加した珪石粉スラリーを直径３φのノズルより3kg/
cm2の圧力でテストピース表面に80度の角度で衝突さ
せ、各々20時間の耐摩耗試験を行った。Further, for comparison of abrasion resistance, the above-described test piece obtained by the curing method of the present invention and a test piece obtained by the conventional curing method were mixed with a silica stone slurry to which water was added so as to have a particle diameter of 100 μm or less and a solid concentration of 30%. 3kg / nozzle from 3φ diameter
The test piece was made to collide with the surface of the test piece at a pressure of cm 2 at an angle of 80 °, and a wear resistance test was performed for 20 hours.
摩耗テスト後表面粗さ計で損傷部を調査した結果、本
発明処理材は最表層から30〜40μｍが、またガス浸炭材
のそれは30〜100μｍが損傷しており、本発明処理材は
ガス浸炭材に比較して損傷の程度が小さくさらに均一に
損傷されていた。As a result of examining the damaged portion with a surface roughness meter after the abrasion test, the treated material of the present invention was damaged by 30 to 40 μm from the outermost layer, and that of the gas carburized material was damaged by 30 to 100 μm. The degree of damage was smaller than that of the material, and the damage was more uniform.
本発明により、金属材料の表面のCr濃度を高めた後、
金属材料表面全体をFe,Cr及びＣよりなる緻密な複合炭
化物層とすることによって高硬度の表面硬化層を有する
耐摩耗材料の提供が可能となる。According to the present invention, after increasing the Cr concentration on the surface of the metal material,
By forming the entire surface of the metal material as a dense composite carbide layer made of Fe, Cr and C, a wear-resistant material having a hardened surface hardened layer can be provided.
第１図は本発明の一実施例によって得られた処理材の断
面の金属組織を示す光学顕微鏡写真、第２図は同実施例
によって得られた処理材の断面の硬度分布図、第３図は
従来法のクロマイジング処理後のガス浸炭処理によって
得られた処理材の浸炭されていない部分の断面の金属組
織を示す光学顕微鏡写真、第４図は同従来法で得られた
処理材の浸炭されていない部分の断面の硬度分布図、第
５図は従来法のクロマイジング処理後のガス浸炭処理に
よって得られた処理材の浸炭されている部分の断面の金
属組織を示す光学顕微鏡写真、第６図は同従来法で得ら
れた処理材の浸炭されている部分の断面の硬度分布図で
ある。FIG. 1 is an optical micrograph showing a metal structure of a cross section of a processing material obtained according to one embodiment of the present invention, FIG. 2 is a hardness distribution diagram of a cross section of the processing material obtained according to the embodiment, FIG. Is an optical micrograph showing a metal structure of a cross-section of a non-carburized portion of the treated material obtained by the gas carburizing treatment after the conventional chromizing treatment, and FIG. 4 is a carburizing of the treated material obtained by the conventional method. FIG. 5 is an optical micrograph showing a metal structure of a cross section of a carburized portion of a treated material obtained by a gas carburizing process after a conventional chromizing process, and FIG. FIG. 6 is a hardness distribution diagram of a cross section of a carburized portion of the processing material obtained by the conventional method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 篠原 正朝 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 西尾 敏明 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 金子 晨 長崎県長崎市飽の浦町１番１号 三菱重 工業株式会社長崎研究所内 (72)発明者 西 亮 長崎県西彼杵郡時津町久留里郷字永之浦 376―10 滲透工業株式会社長崎工場内 (72)発明者 辻 豊 長崎県西彼杵郡時津町久留里郷字永之浦 376―10 滲透工業株式会社長崎工場内 (56)参考文献 特開 昭63−192854（ＪＰ，Ａ) 特開 平１−205063（ＪＰ，Ａ) 特開 昭64−52055（ＪＰ，Ａ) 特開 昭62−290860（ＪＰ，Ａ) 特開 昭63−171865（ＪＰ，Ａ) 特開 昭64−42565（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatomo Shinohara 1-1, Akunoura-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (72) Inventor Toshiaki Nishio 1-1, Akunoura-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd.Nagasaki Research Institute (72) Inventor Akira Kaneko 1-1, Akunouracho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd.Nagasaki Research Institute (72) Inventor Ryo Nishi, Nagato Prefecture 376-10 Noura Inside the Nagasaki Factory of Tohru Kogyo Co., Ltd. (72) Inventor Yutaka Tsuji Naganoura 376-10, Kururigo, Togitsu-cho, Nishisonogi-gun, Nagasaki Pref. JP-A-192854 (JP, A) JP-A-1-205563 (JP, A) JP-A-64-52055 (JP, A) JP-A-62-290860 (JP, A) JP-A-63-171865 (JP, A) ) JP-A-64-42565 (JP, A)
Claims (1)
表面のCr濃度を高めた後、該Cr濃度を高めた金属の表面
に水素ガス又はアルゴンガスの共存下でプラズマ浸炭処
理を行い、金属表面に高硬度のFe,Cr及びＣからなる複
合炭化物層を形成させることを特徴とする金属の表面硬
化方法。Claims: 1. A metal to be treated is diffused and infiltrated with Cr to increase the Cr concentration on the surface, and then the surface of the metal with the increased Cr concentration is subjected to plasma carburizing in the presence of hydrogen gas or argon gas. And forming a complex carbide layer made of Fe, Cr and C with high hardness on the surface of the metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257123A JP3021014B2 (en) | 1990-09-28 | 1990-09-28 | Metal surface hardening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257123A JP3021014B2 (en) | 1990-09-28 | 1990-09-28 | Metal surface hardening method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04136153A JPH04136153A (en) | 1992-05-11 |
| JP3021014B2 true JP3021014B2 (en) | 2000-03-15 |
Family
ID=17302052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2257123A Expired - Lifetime JP3021014B2 (en) | 1990-09-28 | 1990-09-28 | Metal surface hardening method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3021014B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5383980A (en) * | 1992-01-20 | 1995-01-24 | Leybold Durferrit Gmbh | Process for hardening workpieces in a pulsed plasma discharge |
| DE10321414B4 (en) * | 2003-05-13 | 2008-12-18 | Robert Bosch Gmbh | Process for the heat treatment of metallic workpieces in chamber furnaces |
-
1990
- 1990-09-28 JP JP2257123A patent/JP3021014B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04136153A (en) | 1992-05-11 |
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